What version of windows do you have? What happens during the normal boot? Was it working and if so do you know when it stopped working (date and time)? What was done to the system just prior to it's not working? If it works in safe mode you can try a system restore if you know a date and time when it was working. You can trouble shoot the problem using the selective start up feature of msconfig. Please provide the asked for information and we can most likely get it running.
The system sets them automatically. Boot to safe mode and go to system restore. Pick a point that you are pretty sure is earlier than the issue and restore it.
The system sets them automatically. Boot to safe mode and go to system restore. Pick a point that you are pretty sure is earlier than the issue and restore it.